alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET EXPLOIT SUSPICIOUS Possible CVE-2017-0199 IE7/NoCookie/Referer HTA dl"; flow:to_server,established; http.uri; content:".hta"; nocase; fast_pattern; pcre:"/\.hta(?:[?&]|$)/i"; http.user_agent; content:"Mozilla/4.0 (compatible|3b 20|MSIE 7.0|3b|"; depth:34; http.header_names; content:!"Referer|0d 0a|"; content:!"Cookie|0d 0a|"; reference:md5,66a42e338e32fb6c02c9d4c56760d89d; classtype:attempted-user; sid:2024449; rev:4; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2017_07_07, cve CVE_2017_0199, deployment Perimeter, confidence Medium, signature_severity Major, tag CISA_KEV, updated_at 2020_11_05;)